code: def test_builder_to_backend_symbolic(self, compute_unit, backend):
      s0 = get_new_symbol()
  
      val = np.array(
          [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]], dtype=np.float32
      )
      input_placeholders = {"x": mb.placeholder(shape=(s0, 3))}
      input_values = {"x": val}
  
      def build(x):
          return [
              mb.reduce_argmax(x=x, axis=1, keep_dims=True),
              mb.reduce_argmin(x=x, axis=0, keep_dims=True),
          ]
  
      expected_output_types = [
          (s0, 1, types.int32),
          (1, 3, types.int32),
      ]
      expected_outputs = [
          np.array([[2], [2]], dtype=np.int32),
          np.array([[0, 0, 0]], dtype=np.int32),
      ]
  
      run_compare_builder(
          build,
          input_placeholders,
          input_values,
          expected_output_types,
          expected_outputs,
          compute_unit=compute_unit,
          backend=backend,
      )
  
file_path: coremltools/coremltools/converters/mil/mil/ops/tests/iOS14/test_reduction.py
imports: import itertools
  import numpy
  import pytest
  import scipy
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import get_new_symbol, types
  from coremltools.converters.mil.mil.ops.tests.iOS14 import backends
  from coremltools.converters.mil.mil.ops.tests.testing_utils import run_compare_builder
  from coremltools.converters.mil.testing_reqs import compute_units
  from coremltools.converters.mil.testing_utils import random_gen, ssa_fn
label_desc: Use image node_id 6 for calling the TestReduction obj's underlying member method code with example usage: obj.test_builder_to_backend_symbolic(compute_unit, backend) and returns: list